Where is the ignition coil on a Mazda 3?
I believe the ignition coil is located directly on top of the
spark plugs through the center of the valve cover. Remove the black
plastic cover on top of the engine and there will be electrical
wires running to four individual coils on top of each spark plug. I
only had the cover off my engine once so I am doing this from
memory so you may want to double check this with someone else!